Aloha! You're speaking to Dr. Michael SalkinI'm puzzled by the statement "under the skin". Unless the skin were translucent, we wouldn't be able to see under the skin. I suspect that you're describing vitiligo which is an asymptomatic condition that is characterized by one or more macular areas of depigmented skin (leukoderma). No treatment has been consistently documented but the prognosis is good because this is a cosmetic disease that doesn't affect Archie's quality of life. The depigmentation is usually permanent but in some dogs, spontaneous repigmentation eventually may occur.Can you upload a photo of representative skin to our conversation? You can use the paperclip icon in the toolbar above your message box (not if you're using the chrome browser) or you can use an external app such as imgur.com or dropbox.com. I can be more accurate for you if I can see what you're seeing.